/* Copyright (C) 2004 - 2006  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
namespace Db4objects.Db4o.Internal.Convert.Conversions
{
	/// <exclude></exclude>
	public class FieldIndexesToBTrees_5_7 : Db4objects.Db4o.Internal.Convert.Conversion
	{
		public const int VERSION = 6;

		public override void Convert(Db4objects.Db4o.Internal.Convert.ConversionStage.SystemUpStage
			 stage)
		{
			stage.File().ClassCollection().WriteAllClasses();
			RebuildUUIDIndex(stage.File());
			FreeOldUUIDMetaIndex(stage.File());
		}

		private void RebuildUUIDIndex(Db4objects.Db4o.Internal.LocalObjectContainer file)
		{
			Db4objects.Db4o.Internal.UUIDFieldMetadata uuid = file.GetUUIDIndex();
			Db4objects.Db4o.Internal.ClassMetadataIterator i = file.ClassCollection().Iterator
				();
			while (i.MoveNext())
			{
				Db4objects.Db4o.Internal.ClassMetadata clazz = i.CurrentClass();
				if (clazz.GenerateUUIDs())
				{
					uuid.RebuildIndexForClass(file, clazz);
				}
			}
		}

		private void FreeOldUUIDMetaIndex(Db4objects.Db4o.Internal.LocalObjectContainer file
			)
		{
			Db4objects.Db4o.Internal.Fileheader.FileHeader fh = file.GetFileHeader();
			if (!(fh is Db4objects.Db4o.Internal.Fileheader.FileHeader0))
			{
				return;
			}
			Db4objects.Db4o.MetaIndex metaIndex = ((Db4objects.Db4o.Internal.Fileheader.FileHeader0
				)fh).GetUUIDMetaIndex();
			if (metaIndex == null)
			{
				return;
			}
			file.Free(metaIndex.indexAddress, metaIndex.indexLength);
		}
	}
}
